docs: explain cli tool -Tfoo and -T:foo are very different

[sg-qwt]

https://clojure.org/reference/deps_and_cli#tool_install

Clearly explain or notice people the difference between -T with and without colon, so that people don't get confused..

source: https://clojurians.slack.com/archives/C02B5GHQWP4/p1643109069018300?thread_ts=1643104858.017600&cid=C02B5GHQWP4

[puredanger]

Covered in the updated Clojure CLI page